.header{
    /* height: 50px;  为什么这里有这个高度，part_one 会与inner重叠.*/
    line-height: 50px;
}
.header nav{
    height: 50px;
    background-color: #ccc;
}
nav ul li{
    float: right;
    margin-right: 30px;
}
.logo{
    float: left;
    margin-left: 40px;
}
.logo a{
    font-size: 20px;
    color:white;
    font-weight: 700;
    /* 设置每个字之间的间隔 */
    letter-spacing: 2px;
}
.banner{
    height: 600px;
    display: block;
    /* 透明度 */
    opacity: 0.95;
}
.banner .inner{
    /* background-color: #62d1d2; */
    /* background-color: black; */
    margin: 0 auto;
    max-width: 300px;
    text-align: center;
    color: white;
    position: relative;
    top: 180px;
}
.line{
    width: 65%;
    height: 1px;
    background-color: white;
    margin: 0 auto;
}
.inner h1{
    margin-bottom: 10px;
}
.banner .inner p{
    line-height: 30px;
    font-size: 18px;
    letter-spacing: 1px;
}
.banner .inner button{
    margin-top: 20px;
    padding: 10px 20px;
    border-radius: 7px;
    border: none;
    outline: none;
    background-color: #e85e17;
    color: white;
    letter-spacing: 1px;
    /* 鼠标变小手 */
    cursor: pointer;
}
.banner .inner button:hover{
    transform: rotate(360deg) scale(1.2,1.2);
    transition: 1.5s;
}
.banner .inner .more{
    margin-top: 140px;
}
.content{
    /* 透明度 */
    opacity: 0.9;
}
.content .part_one{
    text-align: center;
    color: white;
    background-color: rgba(67,178,165,1);
    padding-top: 65px;
    height: 290px;
}
.wraper{
    margin: 0 auto;
    max-width: 1080px;
}
.wraper h2{
    padding: 15px 0;
    font-size: 27px;
}
.wraper .line{
    margin: 15px auto;
    width: 40%;
    background-color: darkgrey;
}
.wraper p{
    margin: 20px 0;
    font-size: 18px;
    letter-spacing: 1px;
}
.icon{
    margin: 30px auto;
    padding-bottom: 0;
}
.icon .item{
    margin-right: 60px;
    border: 2px solid green;
    display: inline-block;
    width: 80px;
    height: 80px;
    transform: rotate(45deg);
}
.icon .item img{
    width: 100%;
    height: 100%;
    transform: rotate(-45deg);
}
.first .text_right{
    float: right;
}
.first_left{
    width: 41%;
}
.first_left img{
    width: 100%;
}
.first>div{
    /* 添加浮动，浮动后没有了高度 */
    float: left;
}
.clear_fix:after{
    /* 清除浮动，还原高度，是添加给浮动的父元素 */
    content: "";
    display: block;
    clear: both;
}
.part_two{
    background-color: rgb(33,41,50);
}
.first_text{
    position: relative;
    top: 68px;
    left: 50px;
    width: 55%;
    color: white;
}
.first_text h2{
    font-size: 24px;
    margin-bottom: 10px;
}
.first_text .first_title{
    font-size: 20px;
    margin-bottom: 12px;
}
.first_text p{
    font-size: 18px;
    width: 68%;
}
.first:nth-child(odd){  /* 奇偶选择器 */
    /* 交替颜色 */
    background-color: rgba(255,255,255,0.1);
}
.part_three{
    background-color: #3f3965;
    opacity: 0.9;
    color: #fff;
}
.three_wrap{
    margin: 0 auto;
    width: 60%;
}
.part_three .three_text{
    padding-top:65px;
}
.part_three .three_text h1{
    text-align: center;
}
.part_three .three_text .line{
    margin: 25px auto;
    width: 60%;
    height: 2px;
    background-color: #1a0973;
}
.card{
    min-height: 300px;
    max-width: 461px;
    width: 50%;
    padding: 50px;
    float: left;
    margin-top: 20px;
    /* 独立盒子 */
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
.card h2{
    text-align: center;
}
.card:nth-child(1){
    background-color: rgba(0,0,0,0.1);
}
.card:nth-child(2){
    background-color: rgba(0,0,0,0.15);
}
.card:nth-child(3){
    background-color: rgba(0,0,0,0.2);
}
.card:nth-child(4){
    background-color: rgba(0,0,0,0.25);
}
.card:nth-child(5){
    background-color: rgba(0,0,0,0.3);
}
.card:nth-child(6){
    background-color: rgba(0,0,0,0.35);
}
.footer{
    background-color: #333;
    min-height: 200px;
    text-align: center;
    color: #fff;
}
.footer .share_group{
    display: block;
    margin: 0 auto;
    width: 1080px;
    padding: 45px;
}
.footer .share_group li{
    display: inline-block;
    padding: 10px;
}
.active{
    position: relative;
}
.active span{
    position: absolute;
    height: 4px;
    width: 100%;
    background-color: #fff;
    bottom: 5px;
    left: 0;
}
.mask{
    display: none;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgb(0,0,0,0.3);
}
.slider{
    background-color: #333;
    position: fixed;
    top: 0;
    bottom: 0;
    right: -300px;
    width: 300px;
}
.slider ul li{
    margin-top: 30px;
    padding: 20px 30px;
}
.slider ul li a{
    color: #fff;
}
.slider ul li:hover{
    background-color: #d79898;
}
.to_top{
    display: none;
    width: 50px;
    height: 50px;
    position: fixed;
    right: 30px;
    bottom: 100px;
    text-align: center;
}
.to_top img,p{
    width: 100%;
    height: 100%;
}